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UNITED STATES PATENT OFFICE.

JAMES E. ATWOOD, OF BUCKSPORT, MAINE.

PUMP.

Specification of Letters Patent No. 28,140, dated May 8, 1860.

To all whom it may concern:

Be it known that I, JAMES E. A'rwooD, of Bucksport, county of Hancock, and State of Maine, have invented new and useful Improvements in Pumps; and I do hereby declare that the following is a full, clear, and eXactdescription thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, in which- Figure l, represents the pump with the main cylinder thrown up. Fig. 2 represents the pump when down having discharged the water. Fig. 3, represents the stationary partof the pump. Fig. 4, represents the main cylinder, air'chamber and brake. Fig.

represents a double acting pump.

The nature of my invention consists in the combination of the parts of the pump, as hereinafter described.

To enable others skilled in the art to make and use my invention, I will proceed to de scribe its construction and operation.

In the construction of my pump, in Fig. l, the outer valve, B, screw for attaching` to the hose, C, the discharge pipe, D, the fun nel formed hydraulic chamber, E, the valve in said chamber for the passage of water into said chamber, F, suction hose for carrying the water to the chamber, Gr the packing around the upper end of chamber D, for packing the main cylinder, I, the main cylinder, K the air chamber which is the upper part of the main cylinder J. L thumb screw for regulating the air chamber, M the pressure rod, the guide through which the pressure rod passes, and which keeps it always in a vertical line. In Fig. et, N the brake for operating the pump, or the pump can be operated by a foot pad.

In Fig. 5, is represented a duplication of my pump, with the addition of the suction hose connected at B, B, and the discharge hose connected at C, C. H, H, the frame to which is attached the chamber In the operation of my invention I first set the stationary part in the bottom of the well. The main cylinder is then placed in position on chamber D, and the air allowed to escape by means of the thumb screw, L, until the cylinder J, descends to the required height, when the screw is turned and the cylinder is made air tight, and is ready to throw water. The main cylinder is now forced down by the brake or foot pad, over the chamber D, which forces the water up the discharge pipe C. By releasing the pressure from the brake or foot pad, the air in chamber K will cause the cylinder J to rise, and cause the water to rush through hose F, and valve E in to chamber D, when the pump is ready for another stroke which will cause the water to ascend as before.

The chamber D, and cylinder J, are usually made of cast metal, but any material may be used.

Having thus described the construction and operation of my invention, what I claim as new, and desire to secure by Letters Patent is- The combination of the main cylinder J, with air chamber K regulating screw L, stationary chamber D, valves E and A, with discharge pipe C, the whole operating in the manner and for the purpose as set forth.

JAS. E. ATVVOOD.

Witnesses:

W. T. THOMPSON, JAMES KETCHER. 

